We have the honor to welcome you to the 4th Korean-Japanese Combined Pelvic & Acetabular Fracture Conference following the 45rd Annual Meeting of the Korean Fracture Society in Busan. It is a great opportunity and privilege to hold this conference with Prof. Krettek (Germany), Prof. Pohlemann (Germany), Prof. Apivatthakakul (Thailand) and nine renowned doctors from Japan. This conference will be a joint effort of the expert surgeons of this field in Japan and Korea. We believe this conference will be a great chance to learn up-to-date knowledge, to share our academic and clinical experience and to exchange great ideas for management of pelvic and acetabular injury. We all wish you an interesting scientific event but in the same time you will enjoy the traditional hospitality of our country in Busan.